The students spent as much time getting trained as they __studyingA were B had C.did选什么为什么?什么语法现象

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The students spent as much time getting trained as they __studying
A were B had C.did
选什么为什么?什么语法现象

选C,did相当于spent,是为了避免重复

The students spent as much time getting trained as they __studyingA were B had C.did选什么 为什么?什么语法现象